AExE01 · Chapter 1Basic Electrical & Electronics🏛️ Past Licensure QuestionID: b8de7f6e
A large commercial three-phase electrical generating system typically has a generator efficiency of around:
A large commercial three-phase electrical generating system typically has a generator efficiency of around:
Multiple Choice Options
- A✓ Correct Option
96%
- B
90%
- C
67%
- D
55%
Detailed Technical Solution & Explanation
Large commercial three-phase synchronous generators in utility power plants are designed with low stator copper losses, hydrogen or water cooling, and high-permeability laminated steel cores, achieving very high full-load operating efficiencies of approximately 95% to 98% (typically 96%).
Option Analysis:
•
Option A (96%): Correct. Typical full-load efficiency for large utility 3-phase alternators.
•
Option B (90%): Incorrect.
•
Option C (67%): Incorrect.
•
Option D (55%): Incorrect.
Reference: Mock Test 06NEC Licensure Syllabus